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Material System Design Studies of High Temperature Gas-Cooled Solid Breeder Blanket Module

ITER TBM Project Meeting UCLA, USA 2/23-25, 2004. Material System Design Studies of High Temperature Gas-Cooled Solid Breeder Blanket Module. A.Hasegawa (Tohoku Univ.) A.Shimizu, T.Yokomine (Kyushu Univ.). Summary of Current Status for TBMs

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Material System Design Studies of High Temperature Gas-Cooled Solid Breeder Blanket Module

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  1. ITER TBM Project Meeting UCLA, USA2/23-25, 2004 Material System Design Studies of High Temperature Gas-Cooled Solid Breeder Blanket Module A.Hasegawa (Tohoku Univ.) A.Shimizu, T.Yokomine (Kyushu Univ.)

  2. Summary of Current Status for TBMs WSG1 (Helium-cooled/Be (F/M steel, SiC/SiC) Blankets - TBM of F/M steel has been proposed - SiC/SiC Blaket: DEMO Design Study (DREAM), SiC/SiC Material Tests, Specimen Irradiation Test, Research on Cooling, Some of them by JUPITER-II WSG2 (Helium-cooled Lithium Lead (F/M steel, SiC/SiC) Blankets - Demo Design Study (Vector), Many activities existed. Interesting aloso for ICF blanket, Proposal will be made WSG3 (Water-Cooled Ceramic/Be (F/M steel) Blankets - Demo Design Study, R&Ds on corrosion, heat transfer, material irradiation being conducted WSG4 (Self-Cooled Lithium (V) Blankets - Network activities in Universities/NIFS, Evaluation of Russian Design, Going to design Japanese Blanket, Planning of R&D, Researches on vanadium alloy, coating, impurity control, tritium recovery, cooling, some of them by JUPITER-II and by IFMIF. WSG5 (Self-Cooled Molten Salt Blankets) - Network activities in Universities/NIFS, Demo Design Sudy of FFHR, R&Ds on many parts (redox control, cooling, tritium recovery, …) some of them by JUPITER-II, by TNT-loop, planning of R&D for TBM.

  3. Dpt. of Quantum Science and Energy Engineering Tohoku University Expected Participants Structure materials : Hasegawa (Tohoku Univ.) Kohyama( Kyoto Univ.) Solid breeding materials : Enoeda (JAERI) Shikama( Tohoku Univ.) Neutron multiplier : TBD (JAERI) Shibayama(Hokkaido Univ.) Thermomechanis : Shimizu (Kyushu Univ.) System design : Konishi (Kyoto Univ.) Tritium recovery system : TBD The advanced Helium cooled blankets will be studied by collaborative works by universities and JAERI.

  4. Current interests in various blankets by parties

  5. Materials and Blanket System Development Reference Material (RAFM) and System Roadmap for Materials and Blanket Development in Japan Approximate calendar year 2015 2020 2030 2040 1st commercial plant Design modification Power Generation Plant Design Construction Operation (Licencing) (Blanket test) ITER Blanket Module Test Advanced Materials (V-alloy, Flibe, SiC/SiC --) and System IFMIF Irradiation Test, Materials Qualification and System Performance Test (Staged construction and operation) Reference Blanket (Mostly JAERI responsibility) Advanced option (Mostly NIFS/University responsibility)

  6. Dpt. of Quantum Science and Energy Engineering Tohoku University Back Ground of this Activities Recent achievement of SiC/SiC composites -1- ●Based on irradiation behavior of SiC, advanced SiC/SiC composites were developed using stoichiometric SiC fibers. ・ increase radiation resistance using advance fiber no mechanical degradation up to 10dpa at 800C high size stability

  7. Dpt. of Quantum Science and Energy Engineering Tohoku University Back Ground of this Activities Recent achievement of SiC/SiC composites -2- ●Development of new matrix processing, NITE, enabled to increase matrix density. The lower porosity and near theoretical density realized high hermeticity and good thermal conductivity of SiC/SiC composites. Joining between SiC/SiC composites was also successful by the NITE process. It is almost ready to fabricate complex shape structure made of SiC/SiC composite such as gas cooling blanket . To start design activity of the blanket system, the technical issues will be discussed in this working group.

  8. What is NITE Process ? • NITE: Nano-Infiltration Transient Eutectic Phase Process • Dense and robust structures (cf. PIP, CVI, …) • Fairly high thermal conductivity • Chemical stability • Thin plate production, surface smoothness, potential gas tightness • Applicability of existing net-shaping techniques • Low production cost

  9. Shape-Variability of NITE Composites Qualification of these composite is in progress under collaboration with high temperature gas turbine program. Kohyama et al.,(2002)

  10. Permeability of NITE Compositesat RT #1 Pilot SiC/SiC by NITE (Ube ) SiC/SiC by NITE SiC/SiC by NITE Monolithic SiC by NITE Hino et al.,(2003)

  11. Dpt. of Quantum Science and Energy Engineering Tohoku University Research Area for High Temperature Gas Blanket System ●Study on blanket system design for high temperature gas-cooling system is startedin Japan to realize high efficiency energy source of fusion power plant. Design and feasibility studies base on the following fields will be discussed in this working group. Material development, Thermomechanics, Tritium recovery system Material Design for High Temperature Blanket System Structural Materials, Sold Breeding Materials, Neutron Multiplier Materials

  12. Dpt. of Quantum Science and Energy Engineering Tohoku University Advanced Gas Cooling System There are two types of gas cooling system 1) Bulk-flow type : one major gas loop 2) Channel type : two major gas loops ( T purge gas loop + He gas cooling loop) Bulk-flow type（DREAM） Channel type （DEMO, HCPB）

  13. Bulk-Flow Type DREAM ＞900℃ Heat Efficiency High Blanket Heat Exchanger Tritium Recovery System Tritium Recovery Efficiency High

  14. Channel type Blanket Cooling Loop Tritium Recovery Loop ＞900℃ ＞1000℃ High Heat Efficiency High Tritium Recovery Efficiency

  15. Dpt. of Quantum Science and Energy Engineering Tohoku University Key issues of this Blanket System ●To realize high energy efficiency of blanket, higher temperature (900℃)outlet-gas is required. ●To obtain higher temperature outlet gas, temperature of wall and solid breeder becomes much higher than the gas temperature. ●High temperature performance of solid breeding materials such as resistance to sintering and creep deformation become important. ●Upper limit of current solid breeding materials : <900C ●New breeding material which has higher temperature resistance is needed to utilize high temperature capability of SiC/SiC composite. ex. coating or dendrite structure breeding materials

  16. Dpt. of Quantum Science and Energy Engineering Tohoku University Sumary ●In the high temperature gas cooling system, many material and system issues remain and some break-through of high temperature resistance of breeding material are required. ●Japan proposes to include testing of SiC/SiC composite and high temperature blanket concepts in TBMs. ●Considering about limited resources and timeframe, this advanced blanket module is expected to join later phase of ITER.

  17. Dpt. of Quantum Science and Energy Engineering Tohoku University Title

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